Stereoselective preparation of 6β -substituted penicillanates
作者:D.Ivor John、Nicholas D. Tyrrell、Eric J. Thomas
DOI:10.1016/s0040-4020(01)92141-6
日期:1983.1
6β-methoxycarbonylethyl-, 6β-(t-butoxycarbonylmethyl)-, and 6β-methylthiopenicillanates 10–15 have been prepared stereo-selectively by tri-n-butyltinhydridereduction of the corresponding 6β-isocyanopenicillanates 4–9 A minor side-product (15%) isolated from the reduction of benzyl 6α-(2-hydroxyprop-2-yl)-6β-isocyanopenicillanate 5 was identified as (1R, 5R)-6-[(1R)-1-benzyloxycarbonyl-2-methylprop-1
Penicillin derivatives, process for their preparation and pharmaceutical compositions containing certain of these compounds
申请人:BEECHAM GROUP PLC
公开号:EP0013617A1
公开(公告)日:1980-07-23
This invention relates to a process for the preparation of certain penicillin derivatives which are useful as β-lactamase inhibitors. The compounds which may be prepared by the process of this invention have formula (I), or a pharmaceutically acceptable salt or ester thereof:
wherein R represents hydrogen, halogen, C1-6alkylthio, C1-6alkyl or alkyl substituted with phenyl, carboxy, C1-6alkoxycarbonyl, hydroxyorC1-6alkylthio, and n is zero, 1 or 2. In addition certain of the compounds produced by the process of the invention are novel compounds.